Add tests

BudgetApp/Services/AccountService.cs

@@ -3,14 +3,9 @@ using BudgetApp.Data;
 
 namespace BudgetApp.Services;
 
-public class AccountService
+public class AccountService(ApplicationDbContext db)
 {
-    private readonly ApplicationDbContext _db;
-
-    public AccountService(ApplicationDbContext db)
-    {
-        _db = db;
-    }
+    private readonly ApplicationDbContext _db = db;
 
     public async Task<List<Account>> GetAccountsAsync(string userId)
     {

BudgetApp/Services/CategoryService.cs

@@ -3,9 +3,9 @@ using BudgetApp.Data;
 
 namespace BudgetApp.Services;
 
-public class CategoryService
+public class CategoryService(ApplicationDbContext db)
 {
-    private readonly ApplicationDbContext _db;
+    private readonly ApplicationDbContext _db = db;
 
     private static readonly (string Name, string Icon)[] DefaultCategories =
     [
@@ -26,11 +26,6 @@ public class CategoryService
         ("Gifts", "🎁")
     ];
 
-    public CategoryService(ApplicationDbContext db)
-    {
-        _db = db;
-    }
-
     public async Task<List<Category>> GetCategoriesAsync(string userId)
     {
         return await _db.Categories

BudgetApp/Services/DashboardService.cs

@@ -2,18 +2,11 @@ using BudgetApp.Data;
 
 namespace BudgetApp.Services;
 
-public class DashboardService
+public class DashboardService(TransactionService transactionService, AccountService accountService, CategoryService categoryService)
 {
-    private readonly TransactionService _transactionService;
-    private readonly AccountService _accountService;
-    private readonly CategoryService _categoryService;
-
-    public DashboardService(TransactionService transactionService, AccountService accountService, CategoryService categoryService)
-    {
-        _transactionService = transactionService;
-        _accountService = accountService;
-        _categoryService = categoryService;
-    }
+    private readonly TransactionService _transactionService = transactionService;
+    private readonly AccountService _accountService = accountService;
+    private readonly CategoryService _categoryService = categoryService;
 
     public async Task<DashboardData> GetDashboardDataAsync(string userId, DateTime? from = null, DateTime? to = null)
     {
@@ -53,7 +46,7 @@ public class DashboardService
         };
     }
 
-    private static ChartData BuildChartData(List<Account> accounts, List<Transaction> transactions, DateTime startDate, DateTime endDate)
+    internal static ChartData BuildChartData(List<Account> accounts, List<Transaction> transactions, DateTime startDate, DateTime endDate)
     {
         var today = DateTime.Today;
         var labels = new List<string>();

BudgetApp/Services/TransactionService.cs

@@ -3,14 +3,9 @@ using BudgetApp.Data;
 
 namespace BudgetApp.Services;
 
-public class TransactionService
+public class TransactionService(ApplicationDbContext db)
 {
-    private readonly ApplicationDbContext _db;
-
-    public TransactionService(ApplicationDbContext db)
-    {
-        _db = db;
-    }
+    private readonly ApplicationDbContext _db = db;
 
     public async Task<List<Transaction>> GetTransactionsAsync(string userId)
     {
@@ -248,7 +243,7 @@ public class TransactionService
         }
     }
 
-    private static DateTime GetNextOccurrence(DateTime current, RecurrenceType recurrence) => recurrence switch
+    internal static DateTime GetNextOccurrence(DateTime current, RecurrenceType recurrence) => recurrence switch
     {
         RecurrenceType.Daily => current.AddDays(1),
         RecurrenceType.Weekly => current.AddDays(7),